i don't come here to disagree with folk's..because if some one say's the sun's up some will say it's not.
there probably logical reason.
arf Kit was donated free to our rc club
by a HS shop near us for the fly in.and was probly one of the first arf kit's produced.and not selling.sitting on the shelf.i still have the box. i use it to store scrap balsa in.on the box it say's durable plastic covering.not mono coat
mono coat dose not refer to there covering as plastic.
hanger 9 may have made some drastic improvement's
after the first production.one being poor wing insadence.as this one did.i surely hope so.mine fly's fine now after a bunch of meticulous re engineering. I'm glade you and your fellow flyer's's are having good success with them.
happy flying.